package org.apache.lucene.index;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.document.Fieldable;

final class StoredFieldsWriterPerThread {

    final FieldsWriter localFieldsWriter;
    final StoredFieldsWriter storedFieldsWriter;
    final DocumentsWriter.DocState docState;

    StoredFieldsWriter.PerDoc doc;

    public StoredFieldsWriterPerThread(DocumentsWriter.DocState docState, StoredFieldsWriter storedFieldsWriter) throws IOException {
        this.storedFieldsWriter = storedFieldsWriter;
        this.docState = docState;
        localFieldsWriter = new FieldsWriter((IndexOutput) null, (IndexOutput) null, storedFieldsWriter.fieldInfos);
    }

    public void startDocument() {
        if (doc != null) {
            // Only happens if previous document hit non-aborting
            // exception while writing stored fields into
            // localFieldsWriter:
            doc.reset();
            doc.docID = docState.docID;
        }
    }

    public void addField(Fieldable field, FieldInfo fieldInfo) throws IOException {
        if (doc == null) {
            doc = storedFieldsWriter.getPerDoc();
            doc.docID = docState.docID;
            localFieldsWriter.setFieldsStream(doc.fdt);
            assert doc.numStoredFields == 0 : "doc.numStoredFields=" + doc.numStoredFields;
            assert 0 == doc.fdt.length();
            assert 0 == doc.fdt.getFilePointer();
        }

        localFieldsWriter.writeField(fieldInfo, field);
        assert docState.testPoint("StoredFieldsWriterPerThread.processFields.writeField");
        doc.numStoredFields++;
    }

    public DocumentsWriter.DocWriter finishDocument() {
        // If there were any stored fields in this doc, doc will
        // be non-null; else it's null.
        try {
            return doc;
        } finally {
            doc = null;
        }
    }

    public void abort() {
        if (doc != null) {
            doc.abort();
            doc = null;
        }
    }
}
